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EDWARD S. BLACK, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN MANGANESESTEEL COMIPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

MILL-PINION.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed January 22, 1919. Serial No. 272,422.

To all whom it may concern:

Be it known that I, EDWARD S. BLACK, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Mill-Pinions, of whichthe following is a specification.

My invention relates to mill pinions and particularly to the two parttype of mill pinion for use in rolling mills, blooming mills and thelike.

I am aware that two part pinions have heretofore been made but theobjection to the two part pinions as heretofore made has been thattransmission of power from one part to the other has not beensuccessfully maintained, especially where these pinions were used inreversing mills. Where the pinion has been made from a casting andapplied to a wrought steel shaft, practical experience has shownthat'the shaft breaks from the pinion part, all of which tends toincrease the expense of the pinions and of maintenance of same. Sincethe advent of alloy steel used in manufacturing these pinions, thequestion of heat treatment has become an important one. Therefore, toprovide a mill pinion having alloy steel pinion teeth, such, forinstance, as manganese steel teeth, it was found that when these pinionswere made in the form of shells or rings to permit proper heat treatmentand then were applied to wrought steel shafts the ring portionsoutlasted the shaft portions. Later two part pinions were made havingthe pinion part cast integrally with the neck portion which neck portionwas made of alloy steel, the difliculty in this construction being thatpositive rotation between the two parts of the pinion could not bepositively maintained with any degree of certainty, ex-

perience showing that the two parts often separated. I

My invention has to do with overcoming the above recited and otherobjections in the present practice of two part alloy steel mill pinions.

One of the objects of my invention is t improve two part mill pinions.

Another object is to provide a two part mill pinion made of alloy steelhaving positive driving connection between the two parts.

A'further object is to provide a two part mill pinion having means foreffecting positive driving connection between the two parts in eitherdirection of rotation and which means do not depend upon a third memberfor driving connection.

A still further object is to improve two part mill pinions forsuccessful commercial use.

Attention is directed to the drawings, in

which- Figure l is an elevational view of the preferred embodiment of myinvention, a portion of one of the necks being broken off.

Fig. 2 is a vertical section through Fig. 1.

Fig. 3 is a transverse section on the line 33 of Fig. 1, and

Fig. 4 is a view, partially in section of a modified form.

The form which I have chosen to illustrate my invention embodies twosubstantially similar portions 5 and 6, each portion being made as anintegral casting preferably of manganese steel, including the toothed orpinion portions 7. It is necessary in making such a casting of manganesesteel that the thickness of the various parts be somewhat uniform inorder to prevent internal stresses and strains being set up during heattreatment and also to eliminate the joining of thick and thin portionsin the castings. The end of the neck 8 terminates in a reduced andflattened end portion 10 forming a wabbler for cooperation with theusual coupling boxes. I prefer to provide each of the pinions 7 on theinner ends thereof with what I term shrouds and form in the shroudsinterlocking elements which will become positively engaged when the twopinions are brought together in operative relation to form a single millpinion. One of the pinion members has the shroud portion 11 integraltherewith having shoulders 12 or other elements for positive rotativeconnection and the other pinion portion having the shroud 13 includingsimilar shoulders 14. The formation of the shoulders is clearly shown inFig. 2. It will therefore be observed that when the two pinion portionsare brought together with the inner ends in contact and the shroudsarranged as shown in Fig. 1, the shoulders 12 and 14 will contactwhereby any rotary motion transferred to the neck 9 will be transferredthrough the abutting shoulders 12 and let to the neck portion 8 and anymotion im parted to neck 8 will be transferred to neck 9. Consequently,the rotation may be in either direction withoutcausing separationbetween the two pinion portions. It will be observed, therefore, that bym invention I have provided an alloy steel twopart mill pinion havingmeans for effecting positive driving connection 'in either direction ofrotation between the two parts and that the driving is transmitted fromone part to the other through a portion of the cast-ing"itself and notthrough the agency of any third member.

In Fig. .1- I have shown a modified form of mill pinion on which thereis'no neck portion cast, as under certain conditions of service it isimpossible to afford room necessary to provide neck portions inconnection with these pinions. Therefore, to provide means to'drivepinion members 7 I form sockets 16 in the outer faces of the pinionswhich sockets are in shape anything but circular. For cooperating withthese sockets, the coupling boxes may be provided with an end portionshaped to correspond to the contour of the sockets to effect positiverotary bearing connection therebetween. The other features of thismodified form are the same as shown in the other figures.

For maintaining the pinion portions in axial alinement I provide acylindrical shell 15, the outside diameter of which is such as to permitthe shell to be tightly embraced by the enlarged ends of the members 5,6, as clearly shown in Fig. 2, the purpose of the shell being merely tokeep the two pinion portions 5 and 6 in axial alinement under allconditions of service. This shell performs no function with respect tothe transmission of power from one portion to the other, its onlyfunction being to maintain in alinement the two pinion portions, hence,it is not subjected to any strain or shock.

I am awar that modifications of such a device may be made and suchmodifications as come within the scope of the appended claims, Iconsider as coming within the spirit of my invention.

Iclaim:

1. A mill pinion having two separable annular toothed members -withinterengageableportions for forming. a positive drive connection. I

2. A mill pinion having two separable annular toothed members withinterengageable end portions for forming a positive drive connection.

3. A mill pinion including hollow transverse pinion sections, themeeting ends of said sections having a freely engageable interfittingdriving engagement, and an alining member within the pinion sections.

4. A mill pinion including hollow transverse pinion sections, themeeting ends of said sections having integral freely engageableinterfitting parts forming a driving connection between the pinionsections, and an alining member within the pinion sections.

5. A mill pinion including hollow duplicate transverse half sections,the meeting ends of said half sections having a freely engageableinterfitting driving engagement, and an alining member within the pinionsections. 1

6. A mill pinion including hollow duplicate transverse half sections,each section having peripheral teeth and a shroud at its inner end, theshroud ends of the pinion sections having complementary interfittingshoulders and recesses forming a driving connection between the pinionsections, and an alining member within the pinion sections and bridgingthe joint therebetween.

7. In a device of the class described, in combination, twosubstantiallyhollow similar portions each comprising a neck and apinion, each pinion portion having a shroud extending outwardlytherefrom and having shoulders formed therein, said shoulders of oneportion'being arranged for positive engagement with the shoulders of theother portion when in operative relation, and a sleeve inserted in theenlarged portion of each member tomaintain the same in axial alinement.

Signed at Chicago, Illinois, this 16th day of January, 1919.

EDWARD S. BLACK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

